Quiet Warnings

The identification of Shako Chho, Lhonak and Gurudongmar as Sikkim’s most vulnerable glacial lake clusters should be treated not as another scientific finding, but as a warning that demands action. The October 2023 GLOF already demonstrated how quickly a disaster originating in the high mountains can travel downstream, destroying infrastructure, livelihoods and lives.

The fact that 40 high-hazard glacial lakes in Sikkim have been identified, including 16 in the highest-risk category, is deeply concerning. Even more significant is that these lakes are largely located above 17,000 feet, in terrain where access itself is a formidable challenge. Thirteen of the 16 highest-risk lakes have now been studied. This is commendable scientific work, but assessment must not become a substitute for timely intervention.

Shako Chho presents the most immediate concern. Its fragile terminal moraine, lack of a natural outlet and direct drainage towards Thangu in North Sikkim make the consequences of an outburst potentially serious. The proposal to lower its water level by 20 metres through solar-powered pumping is innovative, but it also raises an uncomfortable question: how do we intervene without disturbing an already fragile system?

That question matters because the Himalayas are not conventional engineering sites. A poorly designed road, tunnel, dam or drainage structure can aggravate the very hazard it seeks to control. Any mitigation at Shako Chho must therefore be guided by the principle of minimum intervention and maximum caution. Independent scientific review and continuous monitoring should be non-negotiable.

There is also a larger issue. Early-warning systems, automatic weather stations and detailed lake mapping are important, but technology alone cannot protect communities. Warning mechanisms must reach people in time, evacuation routes must remain usable and local communities must know exactly what to do when an alert comes.

Climate change is altering the Himalayan risk landscape faster than our institutions are accustomed to dealing with. Sikkim cannot afford to respond to every disaster after it happens. The real test of preparedness is whether we act when the lake is still quiet.